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|
/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
mft.hxx
Abstract:
This module contains the declarations for the NTFS_MASTER_FILE_TABLE
class. The MFT is the root of the file system
Author:
Bill McJohn (billmc) 13-June-91
Environment:
ULIB, User Mode
--*/
#if !defined( _NTFS_MASTER_FILE_TABLE_DEFN_ )
#define _NTFS_MASTER_FILE_TABLE_DEFN_
#include "ntfsbit.hxx"
DECLARE_CLASS( NTFS_ATTRIBUTE );
DECLARE_CLASS( NTFS_UPCASE_TABLE );
class NTFS_MASTER_FILE_TABLE : public OBJECT {
public:
DECLARE_CONSTRUCTOR( NTFS_MASTER_FILE_TABLE );
VIRTUAL
~NTFS_MASTER_FILE_TABLE(
);
NONVIRTUAL
BOOLEAN
Initialize(
IN OUT PNTFS_ATTRIBUTE DataAttribute,
IN OUT PNTFS_BITMAP MftBitmap,
IN OUT PNTFS_BITMAP VolumeBitmap OPTIONAL,
IN PNTFS_UPCASE_TABLE UpcaseTable OPTIONAL,
IN ULONG ClusterFactor,
IN ULONG FrsSize,
IN ULONG SectorSize,
IN BIG_INT VolumeSectors,
IN BOOLEAN ReadOnly DEFAULT FALSE
);
NONVIRTUAL
UNTFS_EXPORT
BOOLEAN
AllocateFileRecordSegment(
OUT PVCN FileNumber,
IN BOOLEAN IsMft
);
NONVIRTUAL
BOOLEAN
FreeFileRecordSegment(
IN VCN SegmentToFree
);
NONVIRTUAL
UNTFS_EXPORT
BOOLEAN
Extend(
IN ULONG NumberOfSegmentsToAdd
);
NONVIRTUAL
PNTFS_ATTRIBUTE
GetDataAttribute(
);
NONVIRTUAL
PNTFS_BITMAP
GetMftBitmap(
);
NONVIRTUAL
PNTFS_BITMAP
GetVolumeBitmap(
);
NONVIRTUAL
VOID
EnableMethods(
);
NONVIRTUAL
VOID
DisableMethods(
);
NONVIRTUAL
BOOLEAN
AreMethodsEnabled(
) CONST;
NONVIRTUAL
ULONG
QueryClusterFactor(
) CONST;
NONVIRTUAL
ULONG
QueryFrsSize(
) CONST;
NONVIRTUAL
BIG_INT
QueryVolumeSectors(
) CONST;
NONVIRTUAL
ULONG
QuerySectorSize(
) CONST;
NONVIRTUAL
PNTFS_UPCASE_TABLE
GetUpcaseTable(
);
NONVIRTUAL
VOID
SetUpcaseTable(
IN PNTFS_UPCASE_TABLE UpcaseTable
);
NONVIRTUAL
BIG_INT
QueryFrsCount(
);
private:
NONVIRTUAL
VOID
Construct(
);
NONVIRTUAL
VOID
Destroy(
);
PNTFS_ATTRIBUTE _DataAttribute;
PNTFS_BITMAP _MftBitmap;
PNTFS_BITMAP _VolumeBitmap;
PNTFS_UPCASE_TABLE _UpcaseTable;
ULONG _ClusterFactor;
ULONG _BytesPerFrs;
BOOLEAN _MethodsEnabled;
BOOLEAN _ReadOnly;
BIG_INT _VolumeSectors;
ULONG _SectorSize;
};
INLINE
BOOLEAN
NTFS_MASTER_FILE_TABLE::FreeFileRecordSegment(
IN VCN SegmentToFree
)
/*++
Routine Description:
Free a File Record Segment in the Master File Table.
Arguments:
SegmentToFree -- supplies the virtual cluster number withing
the Master File Table of the segment to be
freed.
Return Value:
TRUE upon successful completion.
--*/
{
DebugAssert(_MftBitmap);
return _MethodsEnabled ?
(_MftBitmap->SetFree(SegmentToFree, 1), TRUE) : FALSE;
}
INLINE
PNTFS_ATTRIBUTE
NTFS_MASTER_FILE_TABLE::GetDataAttribute(
)
/*++
Routine Description:
This routine computes the MFT's $DATA attribute.
Arguments:
None.
Return Value:
The data attribute for this class.
--*/
{
return _MethodsEnabled ? _DataAttribute : NULL;
}
INLINE
PNTFS_BITMAP
NTFS_MASTER_FILE_TABLE::GetMftBitmap(
)
/*++
Routine Description:
This routine computes the MFT's $BITMAP attribute.
Arguments:
None.
Return Value:
The mft bitmap.
--*/
{
return _MethodsEnabled ? _MftBitmap : NULL;
}
INLINE
PNTFS_BITMAP
NTFS_MASTER_FILE_TABLE::GetVolumeBitmap(
)
/*++
Routine Description:
This routine return the volume bitmap
Arguments:
None.
Return Value:
The volume bitmap.
--*/
{
return _MethodsEnabled ? _VolumeBitmap : NULL;
}
INLINE
VOID
NTFS_MASTER_FILE_TABLE::EnableMethods(
)
/*++
Routine Description:
This method enables the methods provided by this class.
This method and its complement allow the user of this class to declare
when the passed in data attribute and mft bitmap are good enough to
use.
After the class is initialized, all of the methods are enabled.
Arguments:
None.
Return Value:
None.
--*/
{
_MethodsEnabled = TRUE;
}
INLINE
VOID
NTFS_MASTER_FILE_TABLE::DisableMethods(
)
/*++
Routine Description:
This method disables the methods provided by this class.
This method and its complement allow the user of this class to declare
when the passed in data attribute and mft bitmap are good enough to
use.
After the class is initialized, all of the methods are enabled.
Arguments:
None.
Return Value:
None.
--*/
{
_MethodsEnabled = FALSE;
}
INLINE
BOOLEAN
NTFS_MASTER_FILE_TABLE::AreMethodsEnabled(
) CONST
/*++
Routine Description:
This method computes whether or not the methods are enabled.
Arguments:
None.
Return Value:
FALSE - The methods are not enabled.
TRUE - The methods are enabled.
--*/
{
return _MethodsEnabled;
}
INLINE
ULONG
NTFS_MASTER_FILE_TABLE::QueryClusterFactor(
) CONST
/*++
Routine Description:
This routine computes the number of sectors per cluster.
Arguments:
None.
Return Value:
The number of sectors per cluster.
--*/
{
return _ClusterFactor;
}
INLINE
BIG_INT
NTFS_MASTER_FILE_TABLE::QueryVolumeSectors(
) CONST
/*++
Routine Description:
This routine returns the number of sectors on the volume as recorded in
the boot sector.
Arguments:
None.
Return Value:
The number of volume sectors.
--*/
{
return _VolumeSectors;
}
INLINE
ULONG
NTFS_MASTER_FILE_TABLE::QueryFrsSize(
) CONST
/*++
Routine Description:
This routine computes the number of clusters per FRS.
Arguments:
None.
Return Value:
The number of clusters per FRS.
--*/
{
return _BytesPerFrs;
}
INLINE
PNTFS_UPCASE_TABLE
NTFS_MASTER_FILE_TABLE::GetUpcaseTable(
)
/*++
Routine Description:
This method fetches the upcase table for the volume.
Arguments:
None.
Return Value:
The volume upcase table.
--*/
{
return _UpcaseTable;
}
INLINE
VOID
NTFS_MASTER_FILE_TABLE::SetUpcaseTable(
IN PNTFS_UPCASE_TABLE UpcaseTable
)
/*++
Routine Description:
This method sets the upcase table for the volume.
Arguments:
UpcaseTable -- Supplies the volume upcase table.
Return Value:
None.
--*/
{
_UpcaseTable = UpcaseTable;
}
INLINE
ULONG
NTFS_MASTER_FILE_TABLE::QuerySectorSize(
) CONST
{
return _SectorSize;
}
#endif
|
